Apparatus for the projection of images of large opaque objects.



W. L. PATTERSON.

APPARATUS FOHTHE PROJECTION 0F IMAGES OF LARGE OPAQUE OBJECTS.

APPLICATION mm mus. 1913.

1 202,754. Patented Oct. 24, 1916.

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Wiwbvwmo W.L.PAI1ERSON. APPARATUS FOR THE PROJECTION 0F IMAGES OF LARGEOPAQUE OBJECTS. APPLICATION FILED MAY 5. 1913- L,202,754. Patented 0m.24, 1916.

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APPARATUS FOR THE PROJECTION OF IMAGES OF L ARGE OPAQUE OBJECTS.

APPLICATION FILED MAY 5. I913- 1,202,754. Patented Oct. 24,1916.

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UNITED STl-XTES PATENT OFFHZE.

WILLIAM L. PATTERSON, OF ROCHESTER. NEW YORK. ASSIGNOR TO BAUSCH & LOMBC PTICAI, COMPANY. OF ROCHESTER, NEXV YORK, A CORPORATION OF NIGW XOBK.

APPARATUS FOR THE ?ROJECTION OI? IMAGES OJ. LARGE OZAQUE OBJECTS.

Application filed May 5, 1913.

To all whom it may concern Be it known that I, WILLIAM L. PA'r'rIur son,of Rochester, in the county of Monroe and State of New York, haveinvented caerl pparatus for the Projection of Images of Large OpaqueObjects; and I do hereby declarc the following to he a full, clear, andexact description of the same, reference beinn had to the accompanyingdrawings,

' forming a part of this specification, and to Fig. 3 is a cross thereference numerals marked thereon.

My present invention has for its object to provide a projectionapparatus adapted particularly to be used for throwing on the screenenlarged images of opaque objects which 'in themseli es are of largearea, and it comprehends a horizontal support adapted to receive theobjects which is adjustable relatively to the focal plane of theprojection lenses and the arrangement of a plurality of illuminatingelements or lanterns positioned above the support and arranged toilluminate the object so as to eliminate shadows thereon.

To these and other ends the invention consists in certain improvementsand combina tions of parts all as will be hereinafter more fullydescribed, the novel -featurcs being pointed out in the claims at theend of the specification.

In the drawings, Figure 1 is a perspective view of a projectionapparatus constructed in accordance with my inven tion; Fig. 2 is anenlarged front elevation of the dark chamber and associated parts;sectional view taken on the line 3*-3* of Fig. 2; Fig. 4 is a detailside view of the dark chamber casing, and Fig. 5 is an enlargedsectional view taken on the line 5":' of Fig. 4, showing the forward endof one of the lantern housings and the mounting of the adjustablecondenser.

Similar reference numerals in the several figures indicate the sameparts.

Projection apparatus embodying my present invention is intended to beused in the projection of images of opaque objects having a surface areaof upward of twenty inches square, as examples of which I would mentionlarge advertisement sheets, placards, architectural drawings; or maps aswell as mechanical objects, such as parts of marhlnes. In thisconnection the apparatu possesses a distinct advantage especiallySpecification of Letters Patent.

Patented Oct. 24, 1916. Serial No. 765,459.

when the mechanism is of complicated structure, as all of the parts areshown in their natural form and coloring in the greatly enlarged images.i

The apparatus preferably comprises a frame or standard having a top 1supported at the ends upon uprights or columns 2, mounted on a. suitablebasa'3, having at each end the laterally diverging pairsof legs H,supported on wheels or casters 5 which facilitate the adjustment of theprojection apparatus relatively to the screen on which images are to bethrown. Each leg is also provided with on anchoring device such as thescrew 6 provided with hand wheels by which they may be adjusted intocontact with the floor to prevent the accidental displacement of theapparatus after it has been moved into the desired position; The tabletop 1 is preferably a metal casting having a central portion wider thanits ends and provided with a rectangular aperture bordered on its foursides by upwardly extending ribs or projections 7, forming a seat withinwhich is held the casing forming the dark chamber 8. The latter ispreferably rectangular in outline its lower portion being formed byvertica walls surmounted by the frusto pyramidal top portion formed bythe angularly disposed walls 9 and 10 and the front and rear walls 11and 12-. The rear wall 12 is preferably provided with two doors l3-13and the vertical wall of the easing below it is also provided with adoor 14, said doors being capable of opening out wardly. The aperturecovered by the lower door is the larger, and serves as means wherebycertain objects may be placed within the chamber while the doors 13 permit the operator to view the adjustment of the objects on the sup ort.The doors 13 are each provided wit-ii a small flange or projection lfibetween their hinges whereby they are only permitted a limited openingmovement into a plane that is substantially at right angles to the wall.12.

Mounted on the top of the dark chamber and surrounding the openingtherein is a rectangular metal frame 20 provided on its rear sidb with aboss 21 forming: a Socket in which is seated a vertically extendingguide rod 2'2, carrying' the support or standard 9.3 which is clamped inadjusted position by the hand whrrl Q4 and carries the system ofprojection lenses. indicated by 25. In axial alinement with the latter,and also adjustable vertically on the rod 22, is the reflector 2G fordeflecting the rays of light emitted from the lens system in ahorizontal direc- 5 Lion and erecting the image. This reflector ismounted on a suitable frame '27, pivoted at 28 to a slidinp member 29adjnstably secured to the rod 22 by the screw 3 Angular adjustment ofthe reflector 20 relatively )0 to the axis of the pencil of light raysis accomplished by the adjusting screw 31 pass in; through an extension32 on the member 29 and engaging the endof a finger 33 on the frame 27,the latter being normally moved in one direction bya spring 3i. Iletweenthe top of the dark'chamber and the support 23 is a bellows 35, the endsofwhich are secured to said parts.

The support for the objects of which images are to be projected on thescreen,

comprises a platform 40 mounted on a centrally disposed shaft 41 guidedon the cross piece 42 of the Supporting frame, which latter is alsoadjustable vertically on the end standards or columns 22 and held in thedesired position thereon by set screws 43. The shaft 41 is provided withgear teeth 44 cooperating with the gear wheel-45, rotated by the worm 46on the shaft 47, journaled in 80 a bracket extension 480i the crosspiece $2 and fitted at its outer end with an operating hand wheel i9which islocated substantially in the-plane of the rear edge of the tabletop 1, Where it is within convenient reach of the operator. A flexibleopaque cloth 5,0 depends, in the form of a mantle,' about the four sidesof the support 40, completely inclosing the latter and serving as a wallwhich extends the confines of the dark chamber. This cloth is attachedto the underside of theisupport 1 by any suitable form of fasteningdevices and it is preferably arranged so that its meeting edges overlapat the rear side of said support. and being unconnected facilitates thedisplacing of the rear panel of the drapery when applying objects to, orremoving them from the support.

In the use of an apparatus of this charac- 50 ter it is particularlyimportant that the object be illuminated in Such a way as to avoid theformation of shadows and be illumined with light, of equal intensityover the entire surface, especially when the object has a superficialarea of upward of 20 inches square. To this ,end, I employ apluralitv ofilluminatingelements or lanterns; in the present instanee two suchlanterns being illustrated-and disposed to direct, the rays of lightemanating from them 'in a lane inclined at an angle of substantiallyfortv-five degrees to the point of intersection of the axis of the lenssystem and the plane of the aperture in the table top 1. It is for thepurpose of facilitating this arrangement of the lanterns that the topportion oi the dark chamber is made pvraior dal, as this shape provillm-{he o1:\'er im: sides J and 1H disposed relatively in each other at anangle ol' in) degrees l-Iarh of the two lanterns indicated by T l and ismounted in the int-hum! p sition h-line ated. on a suitable lll'zlt'htl.l. serureil lo the support 1 and held in the desirml posi tionindependentlv oi lhe .larli rhauihi-r and in juxtaposition thereto, sothat a light tight engagement is maintained lirtu'ern the front of thelantern housing and the adjacent wall of said chamber. "lheette-31nprovided around its upper edge with ventilating apertures 54thron'gh which the escape of light is prevented from the interior by aflange 55 and similar apertures 56 are also an ranged in the verticalends and front wall of the chamber, which are covered by z. spacedflange 57, as shown in Fig. 3.

The lanterns being disposed in the manner described permits the directillumination of objects without the use of the usual condensers, but itit is desired to employ these. or to use them for intensifying "ieillumination of parts of objects, suitable lenses may be provided, asindicated by mounted in slides 5 movable in guides 60 on the un lersidesof th walls 9 and 10, and adjustable laterally into and out of registerwith the apertures provided therein l) means of an operating projectionor handle 61 on the slide 59 projecting cxteriorly of the casing throughthe slots (52.

Any desired form of illuminating elements may be provided in thelanterns 51 and :72 am in one of these 1 have shown an arc lampcomprising, the adjustable carbons (ill, disposed at right angles toeach other. which may be manipulated by'adjusting devices (H, exteriorlyof the lantern housings 51 and The general structure of the apparatus isdesigned with particular reference to using are lamps so that these maybe readily controlled by the operator and for this reason I carry thecircuit wires 65 into the switch boxes (30 and 67 which arepermanentlpconnected to the ends of the table top 1, the reduced ends ofwhich are extended outwardly slightly beyond the columns 22 for theaceomnmdation of these switches. I alsomount the separate rheostats 68and 69, one for each lamp circuit. on separate brackets 70 and 71, prooctmg laterally from the two pairs of legs 44, an arrangement whichresults in .great convenience to the operator, since all ofthoscjdevioes which it is neoessa r;; f or him to supervise during theoperation of the lanterns, are within convenient reach and mounted onone and the same support.

I claim as my invention:

1. In a projeption apparatus, the combination with a frame piece, a darkchamber thereon comprising a bottom having vertical walls and a top comrising upii iii dly ex tending converging side hm s and a system of proection lenses surmounting the dark chamber, of lanterns disposed inangular position and'directing the light rays into opposite sides of thechamber and brackets on the frame supporting the lanterns.

2. In a projectlon apparatus, the combination with a frame piece, a darkchamber thereon having a rectangular base and a pyramidal top, and asystem of projection lenses above said top, of two lanterns disposed onopp site walls of the topof the chamber and scparate brackets on theframe piece supporting the lanterns in angular position thereon.

3, In a projection apparatus, the combination with a frame pieceprovided with an aperture and having a surrounding flange spaced fromthe edge of the aperture, a dark chamber having side walls resting onthe frame within the flange anda collar mounted on the top of the darkchamber having a surrounding flange, of a system oilenses supported onthe collar, :1 bellows extending between said parts and Having itslowerend secured within said flan mam for illuininating the interior ofthe chamber and l support for objects located hence th the aperture ofthe frame piece.

, 4. In a. projection apparatus, the combination with a frame piece,having an aperture, a rectangular dark chamber haying vertical sidewalls and converging top walls am a s stem of projection lensessin-mounting the chamber, of an object support movable relatively to theaperture in the frame piece and a plurality of .lanteins forilluminating objects placed upon said support.

5. In a projection apparatus, the combination with a frame having anupright at each end and a horizontally disposed apcrtured frame piecethereon, a system of projection lenses arranged centrally above theaperture in the frame and a dark chamber casin, surrounding the latterand disposed between the frame piece and lenses, of a cross piece adjustable vertically on tl10 ll[)l'l.llt$, an 0bject platformindependently adjustable on said cross piece relatively to the framepiece and a lantern mounted on the latter and disposed to illuminateobjects on the platform.

\VILLIAM L. PATTERSON. 'Witnesses: i

RUSSELL B. Gmrri'rii, H. E. STONEHRAKER.

